Electronic properties of thienylene vinylene oligomers: synthesis and theoretical study
作者:G. Neculqueo、V. Rojas Fuentes、A. López、R. Matute、S. O. Vásquez、F. Martínez
DOI:10.1007/s11224-012-9979-0
日期:2012.12
(E)-1,2-bis(2-thienyl)vinylene (TV), (E)-1,2-bis(3-octyl-2-thienyl)vinylene (TOV), (E)-1,2-bis(3-(2-ethylhexyl)-2-thienyl)vinylene (T2EHV), and (E)-1,2-bis-[2,2’-bithienyl] vinylene (BTV) have been synthesized by a combination of formylation reaction and Mc Murry dimerization. UV–Vis spectra of BTV showed the longest wavelength absorption, TOV and T2EHV showed a bathochromic shift to the red compared with TV, due to an increment of delocalization of the conjugated π-system as the result of the weakening of the carbon–carbon double bonds of the thienyl rings due to the substitution of one hydrogen by the alkyl group. Based on optical data, the effect of linear and branched alkyl chain and extension of conjugation length on the electronic properties is discussed. 1H, 13C-NMR, UV–Visible, Fluorescence data are discussed and theoretical DFT and TD-DFT calculations of ground state and excited states have been also considered in the analysis and explanation of results.
(E)-1,2-双(2-噻吩基)亚乙烯基 (TV)、(E)-1,2-双(3-辛基-2-噻吩基)亚乙烯基 (TOV)、(E)-1,2-通过甲酰化组合合成了双(3-(2-乙基己基)-2-噻吩基)亚乙烯基(T2EHV)和(E)-1,2-双-[2,2'-联噻吩基]亚乙烯基(BTV)反应和 Mc Murry 二聚化。 BTV 的紫外-可见光谱显示出最长的波长吸收,TOV 和 T2EHV 与 TV 相比显示出红移,这是由于碳-碳双键减弱导致共轭 π 系统的离域增加。由于一个氢被烷基取代而形成的噻吩环键。基于光学数据,讨论了直链和支链烷基链以及共轭长度的延长对电子性能的影响。讨论了 1H、13C-NMR、紫外可见光、荧光数据,并在结果分析和解释中考虑了基态和激发态的理论 DFT 和 TD-DFT 计算。